Added Asgard page

Added page and illustration. Fixes #2
Merge pull request #5 from benbuitendijk/Add-Asgard

Added Asgard page, fixes #2
Added Niflheim, closes #3

Added page and image.
Merge pull request #6 from benbuitendijk/2.-Add-Niflheim

Added Niflheim, closes #3
Added Jotunheim page, closes #4

Added page and image. Closes issue #4
Merge pull request #7 from benbuitendijk/3-Add-Jotunheim

Added Jotunheim page, closes #4
Merge pull request #8 from benbuitendijk/1FullContent

1 full content